org.ximtec.igesture.util
Class BDVectorTools

java.lang.Object
  org.ximtec.igesture.util.BDVectorTools

public class BDVectorTools
extends Object

Static methods operating on the DoubleVector class.

Version:

1.0, Dec 2006

Author:

Ueli Kurmann, igesture@uelikurmann.ch, Beat Signer, signer@inf.ethz.ch

Constructor Summary

BDVectorTools()

Method Summary

static BigDecimalVector	add(BigDecimalVector v1, BigDecimalVector v2) Performs an addition of two double vectors.
static boolean	hasValidValues(BigDecimalVector vector) Tests if all values in the vector are valid.
static void	init(BigDecimalVector vector, BigDecimal initValue) Initialises the vector with a given value.
static BigDecimalVector	mean(Collection<BigDecimalVector> vectors) Computes the mean vector of a set of vectors.
static BigDecimalVector	normalize(BigDecimalVector vector) Normalises a vector (LP norm is used).
static BigDecimal	normLP(BigDecimalVector vector) Computes the LP norm of the vector.
static BigDecimalVector	scalarDiv(BigDecimalVector vector, int divisor) Computes the scalar division of a double vector.
static BigDecimalVector	sum(Collection<BigDecimalVector> vectors) Computes the sum of a collection of double vectors.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

BDVectorTools

public BDVectorTools()

Method Detail

add

public static BigDecimalVector add(BigDecimalVector v1,
                                   BigDecimalVector v2)

Performs an addition of two double vectors.

Parameters:

v1 - the first vector.

v2 - the second vector.

Returns:

the sum of the two vectors.

init

public static void init(BigDecimalVector vector,
                        BigDecimal initValue)

Initialises the vector with a given value.

Parameters:

vector - the vector to be initialised.

initValue - the initialisation value.

scalarDiv

public static BigDecimalVector scalarDiv(BigDecimalVector vector,
                                         int divisor)

Computes the scalar division of a double vector.

Parameters:

vector - the vector.

divisor - the divisor.

Returns:

the vector divided by divisor.

sum

public static BigDecimalVector sum(Collection<BigDecimalVector> vectors)

Computes the sum of a collection of double vectors. By contract the size of all vectors must be the same.

Parameters:

vectors - a collection of double vectors.

Returns:

a double vector containing the sum of all vectors.

mean

public static BigDecimalVector mean(Collection<BigDecimalVector> vectors)

Computes the mean vector of a set of vectors.

Parameters:

vectors - the collection of double vectors whose mean vector has to be computed.

Returns:

the mean vector of the specified set of vectors.

normLP

public static BigDecimal normLP(BigDecimalVector vector)

Computes the LP norm of the vector.

Parameters:

vector - the vector to compute the LP norm.

Returns:

the LP norm of the vector.

normalize

public static BigDecimalVector normalize(BigDecimalVector vector)

Normalises a vector (LP norm is used).

Parameters:

vector - the vector to be normalised.

Returns:

the normalised vector.

hasValidValues

public static boolean hasValidValues(BigDecimalVector vector)

Tests if all values in the vector are valid. (not NaN, Infinite)

Parameters:

vector - the vector to test.

Returns:

true if all values are valid.